Moralists and philosophers in the 13th and 14th centuries / Beryl Smalley. - Smalley, Beryl, 1905-1984. (OLS)http://pul/name/12442 (W. de Gruyter, 1963)

The soul of the world / Roger Scruton. - Scruton, Roger. (OLS)http://pul/name/32605 (Princeton University Press, 2014)
Bibliografia in nota.